PHP 8.6's release managers just added another release candidate, PHP 8.6.0 RC6, and plan to ship it this week. Matteo Beccati posted the news to the internals list explains it:
Following some discussion, the PHP 8.6 release managers have agreed to schedule an additional release candidate before the GA release of PHP 8.6.0 next week.
The php2shell fix introduced an ABI incompatibility in PHP 8.6, but not in older versions, which is why it was missed. Per our release policy, the API version number therefore needs to be bumped, requiring extensions to be rebuilt.
There is precedent for adding an extra RC in the week before GA, as was done for PHP 8.5, and PHP 8.6 will follow suit.
This RC will also allow us to cherry-pick a few additional fixes in time for PHP 8.6.0.
